Specifications
42 Catalog WSC/WDC-4
g) Standard input/output (I/O) Expansion Interface Card with the following features:
− Proportional/integral (PI) regulator for setpoint control
− Four isolated 24 VDC programmable digital inputs
− An additional analog input for speed feedback to PI regulator
− One frequency input (0 to 200 Hz) for digital control of current limit
− Four programmable isolated digital outputs (24 VDC rated)
− One form A output relay rated at 250 VAC or 24 VDC
− Two NO/NC programmable output relays rated at 250 VAC or 24 VDC
10) The VFD includes the following protective circuits and features:
a) Motor current exceeds 200% of drive continuous current rating.
b) Output phase-to-phase short circuit condition.
c) Total ground fault under any operating condition.
d) High input line voltage.
e) Low input line voltage.
f) Loss of input or output phase.
g) External fault. (This protective circuit permits wiring of a remote NC safety contact to
shut down the drive).
h) Metal oxide varistors for surge suppression are provided at the VFD input terminals.
Options
Reactor
Used for control of line harmonics in some installations.
Incoming Line Termination (Chose one)
• Terminal block
• Non-fused disconnect with through-the-door handle
• Fused disconnect with time delay fuses with through-the-door handle
• Standard interrupting circuit breaker with through-the-door handle
• High interrupting circuit breaker with through-the-door handle
• Ultra high circuit breaker with through-the-door handle
Volts/Amps Meter with 3-phase Switch
General Arrangement
VFD Mounting
VFDs from size VFD 019 through VFD 072 can be factory-mounted on the same units and in the same
location as conventional starters or can be free-standing as shown below. Sizes VFD 090 through 120
are for free-standing only. Dimensions begin on page 66.
Chiller Model
Unit Mounted at
Factory (1)
Unit Mounted in
Field
Free-Standing
(2)
WSC, WDC 050-087 X X
WSC 100-126 X (3) X
WDC 100-126 X
Notes
1. Optional reactor is field-mounted and wired to unit mounted VFD.
2. Optional reactor is factory-mounted in the VFD enclosure.
3. Brackets and interconnecting cables shipped with unit.